Combined sofa seat and bed



y 7, 1953 A. LORENZ ETAL 2,644,171

COMBINED SOFA SEAT AND BED 2 Sheets Sheet 1 Filed April 24. 1951INVENTOR. 71 Lorerg and Harry jvb f y 7, 1953 A.-1 oRE z ETAL 2,644,171

COMBINED SOFA SEAT AND BED 2 Sheets-Sheet 2 Filed April 24. 1951 IINVENTOR. Onion Lorezzg and JiZzw rg W507i Patented July 7 1953 COMBINEDSOFA SEAT AND BED Anton Lorenz, Buffalo, N.Y., and Harry Nook,

' Elizabeth, N. J.

Application April 24, 1951, Serial No. 222,667

8 Claims.

This invention relates to sofa beds which may be converted between sofaseats and beds selectively.

An object of this invention is to. providean improved sofa bed. whichmay be converted by simple manipulations alternately into a bed and asofa seat; which may have a length as a sofa seat approximately equal tothe width of the desired bed; which will open into a full length bed;which resembles an ordinary sofa seat in appearance and size; whichrequires no manually operable locking mechanism to hold the variousparts in either bed or sofa seat positions; with which the sofa seatcushion will have the usual desired height and themattress may have thenormal level of the mattress. in standard beds; which will beastableandrigid in both bed and sofa seat positions, regardless of where. one sitsor lies on it in normal use, and which is relatively simple, compact,durable, practical and inexpensive in construction, convenient inmanipulation and. comfortable in use, and attractive in appearance.

Various other objects and advantages will: be apparent from. thefollowing description of two embodiments of the invention, and thenovelfeatures will be particularly pointed out hereinafter in connectionwith. the appended claims.

In the accompanying drawings:

Fig. l is a perspective of a sofa bed constructed in accordance withthis. invention and in condition for use as a sofa seat.

Fig. 2 is a transverse, sectional elevation; of the same, the sectionbeing taken approximately along the line 22, Fig; 1-;

Fig; 3 is sectional elevation similar to Fig. 2,

but: witlrgthe parts opened. into bed positions;

Fig.4 4 is a sectional elevation similar toFig. 2, but illustrating amodification thereof; and

Fig. 5 is an elevation similar to Fig. 4., but with the parts openedinto bed positions.

In theembodiment of the invention, illustrated in Figs. 1-3, thedeviceincludes a support-formed of. upright end members I and 2 which arearranged face to face but spaced apart, and connected'. by' intermediatecross members 3 and 4 to. form a rigid supporting structure. A- holloworpan-like mattress-supporting: frame 5 such as a shallow box with anopen face, is disposed between theend members i and 2' andiformedofaplurality of sections. 6, l: and. 8-: which, in the bed position, aredisposed edge toedge, asshown in. Fig. 3. The sections 1: and 8 are:connected together at adjacent ends by a hinge 9 disposed att-the-upper,abuttingcorner edgeswhen the sec- 2 tions are in straight-out or bedpositions. flhe side edge lllof section 1, opposite from, the hinge 9,has the form of, a dihedral angle, that is, it is V-shaped, and the'adjacent. edge H of thesection 6 is oblique to the top and bottom faces ofthat section.

Hinges 12 are provided at opposite ends of the sections 6' and 1 tovconnect the abutting edges of those sections. These hinges H aredisposed midway of the width of the oblique: face LI, that is, at a linemidway between the upper and lower faces of the section 5 in the face II, and the connection of the hinges to they-shaped edge [-0. is at thevertex. of that angle. When the sections 6 and l arestraight-Dumasinbedpositions (Fig. 3), the oblique face or edge It abutsagainst the upper part or side of the V-shaped edge It, as shown in Fig.3. The section 7 is provided at. its ends and adjacent the section 8with a dependmg lug i3, and each of these lugs is connected by a pivotpin [4 to one end of an adjacent link l5 which, in turn, is pivoted at"16 to one ofthe end members I or.2. There is-a-link H5 at each'endof thesupport, one being pivoted to the-inner face of. the upright end memberI and th eother to the inner face of the other end member 2. Proferably,each link [5 is L-shaped, and the leg of the L is pivoted. intermediateof its. length on the pivot. 16, and the pin M, which pivota-llyconnects ity to the lug l3, isnear the free-end of the arm of the L.

The free sideedge of the section 8 isprovided at eachv end with aprojecting cam follower H, which may be a pin with a, roller on the end,or just a projecting'pin that extends from eachend face of the section8. Each end piece I andZ is provided on its inside face with a camgroove 18, which has, an upright; section I9 andlaterally extending endterminals or branches 2.0- and 21. The. lower terminal or branch 20'extends rearwardly from the lower end ofthe upright section I9, and theupper terminal or branch 2 I- extends forwardlyand slightly downwardlyat an. incline,

as shown in Fig.5 3. When thesections B, I and 8 are in bed-positions,as shown. in.Fig.-- 3; the cam followers I! will be in the forward ends;of the upper terminals or branches. 2|, but when the sections are foldedinto the sofa seat' positions, as shown in Fig.2, then the followers I!will be disposed inthe lower branches or extensions 20,,as shown. inFig. 2.

A stabilizer rod 22 extends along each end of the section '5, and atone. emiis pivoted: at 23 to an end wall of the section 8, closelyadjacent the hinge 9, and, the upper face of the section 8.

At its other end the rod 22 ispivoted at 25 to the adjacent end face ofthe section 6 adjacent the upper corner which the upper fac of section 6makes with its oblique edge II. Removable seat cushions 25 are providedto rest upon the section I when the sections are in folded or sofaseatpositions, as shown in Fig. 2. A shell or casing 26 telescopes over theunderface of the section 6 when th sections are in the Fig. 3 position,and is hinged at one end to the section 6 by providing elongated slots21' in the end of the shell 26, which receive short studs 28 thatproject from the ends of the section 6.

When the sections are in folded or sofa-seat positions, as shown in Fig.2, the shell 25 will telescope or fit over the forward face and ends ofth sections 6 and form the back rest of the sofa-seat. The forward face29 of the shell 25, which forms the back of the sofa seat, is preferablyupholstered, and the seat cushions 25, at their rear edges, abut againstthe lower edge portion of the upholstered face 29, as shown in Figs. 1and 2. This shell 25, at it upper part, may be longer than th lower partso as to extend over the end pieces I and 2, as shown at 3B in Fig. 1,and rest upon the upper edges of the end members I and 2 when thesection parts are in sofaseat positions. A stop pin 3| on the insideface of each end member acts to limit th rocking movement of the link I5in on direction at that end of the device, a shown in Fig. 3.

In the use of this embodiment of the invention, assume that the variousparts will normally be in the sofa-seat positions shown in Figs. 1 and2, at which time the section 8 will be horizontal and entirely betweenthe cross members 3 and 4. The rear edge of the section 8 is supportedby the engagement of the follower H in the horizontal sections 20 of thelower ends of the cam grooves, and the forward edge of the section 8 issupported through the hinges 9 from the adjacent edge of the section I,and the latter at that same edge is supported through its lugs I3 uponthe pivots I4 and the links I5, the latter being hinged to the endmembers I and 2. The section I rest upon the upper face of the mattresssection 8, and the other section 6 extends upwardly and rearwardly at anincline, all as shown in Fig. 2. The shell 26 is telescoped over themattress section 6, and its upholstered face 23 The forms the back restof the sofa seat. cushions 25 rest upon the intermediate section I, sothat we have a normally appearing sofa seat, as shown in Fig. 1.

To convert this sofa seat into a sofa bed, one first removes thecushions 25, and then grasps the upper edge of the section 6 and pullsit forwardly, which would be to the left in Fig. 2.

Since the section 6 abuts at its oblique face II against one side of thV-shaped edge it, this forward movement of the section 6 will also swingthrough upright position towards the position shown in Fig. 3, it willpull the section B forwardly until the cam followers II again reach thelower ends of the upright sections I9 of the cam grooves.

The adjacent edges of sections I and 8, which grooves.

are connected by hinges 9, will abut, and hence rocking of section I onpivots I i will, swing the section 8 with the section I in acounter-clockwise direction in Figs. 2 and 3, on the pivots M. Duringthis movement th cam followers Il will move up the upstanding section I9of the cam grooves until they reach the upper end thereof, which willoccur when the sections 5, I and S are all approximately horizontal, asshown in Fig. 3. At that time the links I5 would be vertical, and thenthe sections are pulled forwardly for a short movement, during which thelinks #5 will rock counter-clockwise and lower slightly the pins I4, andat the same time the cam followers at the rear edge portion of thesection 8 will move down the forwardly and downwardly inclined branchesZI of the cam grooves. These downward movements of the cam follower I?will be approximately the same as the downward movements of the pin IA,so that the section 8 will remain horizontal.

As the section 6 moves into the horizontal position, the shell 26 willswing downwardly into the position shown in Fig. 3, and will rest uponthe floor and form an upstanding post or prop to support the free,forward edge of the section 6. The frame 5 formed of sections 5, l and6, in this straight-out or bed position will be supported at its forwardedg or side by the shell 26, at an intermediate point by the pivots I4,and adjacent the rear edge portion of the section 3 by the engagement ofthe followers I? in the forwardly and downwardly inclined branches 25 ofthe cam The engagement of the lower ends of the links I5 with the stops3I limits the rocking movement of the links I5 in one direction and thusprevents further forward lowering of the pins I 4. It will be noted thatdownward pressure on the pins I l, such as would be caused by any weighton the mattress sections, would tend to rock the links I5 furthercounter-clockwise, and since this rotation is prevented by the stops (H,We have a rigid support for the section I at its rear edge. Any rearwardhorizontal pressure on the sections 6, i and 8, when in bed-positionsshown in Fig. 3, if it is to cause a folding of these sections, must besufiicient to force the cam followers up th inclined cam groove sections2| and to rock the links I5 rearwardly, which would elevate the pivotpins I 4. This require force, and it is unlikely that any accidental orunintentional pushing in a rearward direction on th bed would cause itto collapse or fold up.

To reconvert the device into a sofa seat, one first pushes rearwardly onthe extended sections in their Fig. 3 positions until the followers I!reach the upper ends of the upright sections IQ of the cam grooves, andthen the section 6 is lifted, which rocks all of the sections 6, I and 8about the pivots I4. This lowers the followers I! to: the lower ends ofthe cam grooves. The cam groove sections I 9 are arcuate, With theircenters of curvature at the related pivots Id, when the pivots I4 are inthe positions shown in Fig. 2. After the followers I! reach the lowerends of the upright cam groove sections I9, the sections 6, I and 8 arepushed rearwardly to a further extent, during which the followers I!move rearwardly in the lower, horizontal branches 20 of the cam grooves,and then the section 7 is folded over upon the section 8, during whichthe section 8 moves forwardly. The section 6 is rocked into its upwardlyand rearwardly inclined position shown in Fig. 2. When the section 6 israised and thrown backwardly into the Fig. 2 position,

edge, and confine them there in any suitable manner.-

In the modification of the invention illustrated in Figs. 4 and 5, theconstruction is quite similar to that shown in' Figs. 1-3, except for afew changes which will now he explained. In this modification of theinvention, parts identical to those in Figs. 1 to 3 will have the samereference characters as in Figs. 1 to 3, and those similar but slightlymodified have the same numerals with an wadded; The shell 26a is fixedon the section 6, and to provide the prop at the free edge ofsection 6,when it is in bed position, weprovide two rods 32, one at each end ofthe section 5 and hinged by pins 33 to the adjacent outside end walls ofthe section. 6; Each rod 32 has a crook at its pivoted end so that itresembles somewhat a. shepherds staff. or crook. The pivot pin 33 is inthe free end of the crook or curved end'of the staff or rod, so thatwhenthe rods 32 are folded into the dot and dash line position; shown inFig. 5', they will lie along, the outside end'wall's of. section 6'.There is a small space between the end walls of sectionfi and thecorresponding end walls of shell 26a in which rods 32 may be receivedand secured. After the sections. are. swung into bed positions, one thenswings these rods 32 counter-clockwise into the full line positions.shown in Fig. 5. In their full line positions they are inclinedrearwardly and downwardly with thefoot below the pivot. 33,. so that.any weight on the. section 6 will not tend to rock the rods. 32 either.clockwise or counterclockwise, further counter-clockwise rocking beingprevented by engagement of the rods 32 with the free side edge of thesection. 6..

Another modification in the construction shown in Figs. 1-3, is to usestraight links I50, instead of L-shaped links 55, and to make the upperbranches 2 Id of the cam grooves l8a extend rear:- wardly and.downwardly, instead of forwardly and downwardly. In view of this changein the shape of the links 15, the stops Ella are moved to the other sideof the links l5a, because when the sections 6, l and it are openedoutwardly, they will be given a final horizontal push rearwardly insteadof forwardly, during which the cam followers l'l will ride rearwardlyand downwardly in the branch grooves Zia, and the links 8- will moverearwardly until their lower ends engage the stop pins 31a, whichcorrespond to the stop pins 3! of Figs. l-3. The conversion of thisdevice between. sofa seat and bed positions is substantially the same asexplained in connection with Figs; l-3, except for the differencespointed out above.

Any downward pressure on the section- 1- at the side having the'lugs l3,will tend to rock the links a clockwise when. the sections are inbedpositions, and since this movement is limited by stops 35a, thatpressure will not cause or tend to cause a folding of thesectionsintothe sofa seat positions, nor any forward movement, such asisnecessary at the startof a conversion movement.

It will be understood that various changesin the. details andarrangements" of parts, which have been herein described and illustratedin order to explain the nature of'theinvention may be made by thoseskilled in. the art within the principle and scope of the invention asexpressed in" the appended claims.

We claim as our invent-ion:

1. A. sofa bed comprising asupport having spaced; upright, parallel endpieces connected by cross pieces, a mattress-supporting frame dis posedbetween said end pieces and formed of three sections; hingesconnectingsaid sections in succession edge: to edge, so that said sectionstogetherma'y-extend forwardlyof'the frame-in bed position but' arefoldable upon said hinges when in sofa seat position, to place theintermediate section upon one end section between said end pieces. withthe outer end section ascendingfrom' the rear" edge of the intermediatesection. toform a back rest, each of said end pieces at its inside faceandnear its rear having a cam slot with an ascending, intermediatearcuate portion, a rearwardly, extending branch at its lower end, andalateral branch at its upper end which is slightly downwardly inclinedaway from the upper end of the intermediate portion, a cam followercarried on each end of said one section, near its rear edge, and eachrunning in and guided by the cam slot in the adjacent end piece, thecenter of curvature of said arcuate portion being forward- 1yoi thearcuate portion, a generally upright link near each end of the support,eachpivot'ed at one point to the support and at another point to thatedge portion of the intermediate section which is hinged to said one endsection, to support said edge portion of said intermediate section. inboth folded and unfolded positions of said frame for limited forward"and rearward movement as said link oscillates on its pivotalconnectionto said' support, and a support connected to the free edge ofsaid outer end section to engage the fi'oor and support that free edgewhen the sections are in extended; bedposition.

2. A sofa bed comprising a support having spaced", upright, parallel endpieces connected by cross'pieces', a mattress-supporting frame disposedbetween said end pieces and formed of three sections, hinges connectingsaid sections in succession edge to edge, so" that said sectionstogether may extend forwardly of the frame in bed position but arefoldable upon said hinges, when in sofa seat position, to place theintermediate section upon one end sectionbetween said end pieces, withthe outer end section ascending from the rear edge of the intermediatesection to form a back rest, a cam follower carried by each end of saidone end section near its rear edge, each adjacent end piece having a camslot with an ascending, arcuate intermediate portion and a rearwardextension at the lower end of the arcuate portion and a lateralextension at theupper. end of the arcuate portion, in which thefollo'werruns to positively guide said rear edge of said one end sectionup and down when the sections are folded and unfolded, and thengenerally horizontally at each end of the arcuate portion, the center ofcurvature of said arcuate portion. being forwardly of that portion, linkmeans hingedly connecting the edge portion of the intermediatesection'w'hich is hinged to said. one end section, to said end pieces.near the front thereof to support. said edge portion of saidintermediatesectionin both foldedv and unfolded positions of said framefor limited for- 7 ward and rearward movement, and a support connectedto the free edge of said outer end section' to engage the floor andsupport that free edge when the sections are in extended, bed position.

3. A sofa bed comprising a support having spaced, upright, parallel endpieces connected by cross pieces, a mattress-supporting frame disposedbetween said end pieces ancl formed of three sections, hinges connectingsaid sections in succession edge to edge, so that said sections togethermay extend forwardly of the frame in bed position but are foldable uponsaid hinges when in soft seat position, to place the intermediatesection upon one end section between said end pieces, with the outer endsection ascending from the rear edge of the intermediate section to forma back rest, a cam follower carried by each end of said one end sectionnear its rear edge, and a cam carried by each adjacent end piece andhaving a cam slot in which said follower runs with an ascending arcuateintermediate portion to guide said rear edge of said one end section upand down when the sections are folded and unfolded, said cam slot havinga rearwardly extending, lateral extension from the lower end of theascending intermediate portion and a slightly downward inclined lateralportion leading from the upper end of said arcuate portion to guide saidone section forwardly and rearwardly and facilitate folding andunfolding movements of said sections, link means hingedly connecting theedge portion of the intermediate section which is hinged to said one endsection, to said end pieces near their front edges to support said edgeportion of said intermediate section in both folded and unfoldedpositions of said frame for limited movement in a forward and rearwarddirection at the beginning and end of each fold in movement, and asupport connected to the free edge of said outer end section to engagethe floor and support that free edge when the sections are in extended,bed position.

4. A sofa bed comprising a support having spaced, upright, parallel endpieces connected by cross pieces, a mattress-supporting frame disposedbetween said end pieces and formed of three sections disposed in ahorizontal row and edge to edge, a hinge between adjacent side edges ofone end section and the intermediate section, said hinge beingapproximately at the upper face of said one end section, the edge of theother end section that abuts the intermediate section bein in a planeoblique to the faces of that other end section, the edge surface of saidintermediate section that abuts said oblique edge being V-shaped, ahinge at the apex line of the V-shaped edge connecting that edge to saidoblique edge of said other end section at approximately the longitudinalcenter line of that oblique edge, said oblique edge partially overlyingand abutting part of the V-shaped edge when the sections are instraight'out, horizontal edge to edge, relation in which they are in bedpositions, a link hinged at one point to each end piece near its forwardedge, and hinged at another point to said intermediate section closelyadjacent its .edge which is hinged to said one section but at theopposite side of the intermediate section from the hinge between theintermediate section and said one section, each end piece having a camslot with an arcuate, ascending intermediate section, a rearward branchat the lower end of said arcuate section, and a lateral branch at theupper end of the arcuate portion which is slightly downwardly inclinedaway from the upper end of the arcuate portion, and a cam followercarried by each end portion of the unhinged edge of said one section,and running in and guided by the adjacent cam slot, and a prop connectedto the free side edge of said other end section to rest upon the floorand support that edge when the sections are unfolded to assume a bedposition, whereby the intermediate section may be folded over upon saidone end section, and said other end section may be folded upon its hingeto ascend from an edge of the intermediate section, after the latter hasbeen folded over upon said one end section, and form the back rest ofthe sofa seat.

5. A sofa bed comprising a support having spaced, upright end pieces, amattress-supporting frame of three sections disposed between said endpieces, with two of the sections in horizontal. superposed, face to facerelation and the third section upstanding from the rear edge of theupper one of the superposedsections to form a sofa seat, the superposedsections being hinged together at their forward corner edges andapproximately at their abutting faces, the rear edge of the upper one ofthe superposed sections being hinged to the lower edge of the upstandingsection, for movement into straight out, horizontally aligned positionswhen said upper one of the superposed sections is swung forwardly aboutitsconnection to the lower one of said superposed sections, the ends ofsaid upper one of the superposed sections having adjacent its forwardedge, upstanding lugs, a pair of generally upright links, one at eachend of said support, and each pivoted to said support adjacent an endpiece, and each also hinged at a free end to the adjacent one of saidlugs, a cam follower on each end of the lower one of the superposedsections, near its rear edge, the ends of said support having on theirinside faces a cam slot into which the adjacent cam followers extend andby which the followers are guided, each, of said slots having aforwardly and rearwardly disposed branch, in the forward end of whichthe follower at that end of the lower section is engaged when thesections are in sofa seat position, an arcuate section ascending fromthe forward end of said branch, the center of curvature of the arcuatesection being forwardly of that section, and an upper branch sectionextending laterally from the upper end of the arcuate section, thebranches and arcuate sections of each cam slot being in a common plane,said cam slots guiding said rear edge portion of said lower one of thesuperposed sections first rearwardly, then forwardly and then upwardlywhen the hinged sections are unfolded and moved forwardly intostraight-out, horizontal bed positions, and supporting it in both of itselevated and lower positions, and a prop attached to the upper edgeportion of the upstanding section, when the sections are folded, todepend from that section when the sections are unfolded, to engage thefloor and hold that section from descent.

6. A sofa bed comprising a support having spaced, upright end pieces, amattress-supporting frame of three sections disposed between said endpieces, with two of the sections in horizontal, superposed, face to facerelation and the third section upstanding from the rear edge of theupper one of the superposed sections, the superposed sections beinghinged together at their forward edges and approximately at theirabutting faces, the face of the rear edge of the upper 9 r one of thesuperposed sections being V-shaped with the apex of the V extendinglengthwise of the side edge, the lower edge of the upstanding sectionbeing downwardly and rearwardly inclined in a plane which is oblique toboth faces of that upstanding section, the oblique edge of saidupstanding section, midway between the main faces of that section, beinghinged to the rear edge of said upper one of the superposed sections atsaid apex, the ends of said upper one of the superposed sections shavingadjacent its forward edge, upstanding lugs, a generally upright linkpivoted to said support adjacent said end pieces and hinged at a freeend to the adjacent one of said lugs, said support having a stop forengagement by said link to limit rocking movement of said link beyond aselected position in which the link is oblique to a perpendicular, a camand follower connection between the rear side portion of the lower oneof the superposed sections and the end portions of the support to guidethat rear side portion upwardly and downwardly as its forward side iselevated or lowered, and also guide it forwardly and rearwardly when atthe limits of its upward and downward movement, and a prop attached tothe.

upper edge portion of the upstanding section, when the sections arefolded, to depend from that section when the sections are unfolded, toengage the floor, and hold that section from descent.

7. A sofa bed comprising a support having spaced, upright end pieces, amattress-supporting frame of three sections disposed between said endpieces, with two of the sections in horizontal, superposed, face to facerelation and the third section upstanding from the rear edge of theupper one of the superposed sections, the superposed sections beinghinged together at their forward edges and approximately at theirabutting faces, the rear edge of the upper one of the superposedsections being hinged to the lower edge of the upstanding section, formovement into straight out, horizontally aligned positions when saidupper one of the superposed sections is swung forwardly about itsconnection to the lower one of said superposed sections, the ends ofsaid upper one of the superposed sections having adjacent its forwardedge, upstanding lugs, a generally upright link pivoted to said supportadjacent said end pieces andhinged at a free end to the adjacent one ofsaid lugs, .a cam follower on an end of said lower one of the superposedsections, adjacent its rear edge, a cam on the adjacent end piece forguiding said follower, said cam having an upstanding guide portion withgenerally horizontal extensions at its upper and lower limits to guidethe section with the follower forwardly or rearwardly when at its upperand. lower limits, and a prop attached to the upper edge portion of theupstanding section, when the sections are folded, to depend from thatsection when the sections are unfolded, to engage the fioor, and holdthat section from descent.

8. A sofa bed comprising .a. support having forward edges andapproximately at their abut ting faces, the rear edge of the upper oneof the superposed sections being hinged to the lower edge of theupstanding section, for movement into straight out, horizontally alignedpositions when said upper one of the superposed sections 7 is swungforwardly about its connection to the lower one of said superposedsections, the ends of saidupper one of the. superposed sections havingadjacent its forward edge, upstanding'lugs,

. a pair of generally upright links pivoted to said support, oneadjacent to each of said end pieces and each hinged at a free end to theadjacent one of said lugs, a cam follower on each end 01 said lower oneof the superposed sections, adjacent its rear edge, a cam'on theadjacent end piece having a slot in which said follower runs, said camslot having an ascending guide portion lower forwardly and rearwardlywhen at its upper and lower limits, the extension at the lower 7 1 endof the ascending portion of the slot bein rearward only, the upper oneof the extensions of said guide portion being downwardly inclinedsomewhat from the upper end of the ascending guide portion, and a propattached to the upper edge portion of the upstanding section, when thesections are folded, to depend from that section when the sections areunfolded, to engage the floor, to hold that section from descent.

. ANTON LORENZ.

HARRY NOCK.

' References Cited in the file of this patent UNITED STATES PATENTSNumber Name Date 1,017,937 Wersel Feb. 20, 1912 1,349,620 Meves et a1Aug. 17, 1920 1,738,156 'Slyter Dec.'3, 1929 2,534,177 Lorenz et al.Dec; 12, 1950 FOREIGN PATENTS- Number Country Date 54,285 Austria July10, 1912 44,336 France Oct. 1, 1934 (1st addition to No. 755,930) 7381,300 France Nov. 5, 1907 39,258 Sweden Aug. 11, 1915 114,253Switzerland Mar. 16, 1926

